The historical data of Greiman's, a manufacturer of food products, have shown that in a production process for filling jars of mayonnaise, clogs in the filling machine often affect the average volume. The historic standard deviation is 0.6 ounces. In filling 32-ounce jars, a sample of 25 jars found an average volume of 31 ounces. Based on the data provided, calculate the lower limit for a 95% confidence interval